Random rough idling, getting worse

Mine seems to be doing the same, ive only owned it bout 2 weeks. You can sit on 100klms an hour dont miss at all, but when sitting at idle seems to miss a beat randomly.

Exactly the same issue I had mate, random minor miss, no engine light though. Mine started to do it more too under heavy acceleration from down low in 2nd, hesitating. I was quoted something ridiculous from Suzuki for one coil, so I suggest going down a breakers yard and picking up 1 or 2 good ones and swap them in one at a time - good to have a spare then too. It's a 10min job.

Usually an irregular miss at idle is a duff coil pack.

(Even Ed China managed to figure it out with their Saab cabriolet last week)

In the olden days the irregular misfire was down to the flexible lead from the trigger coil in the distributor to the ignition unit breaking internally where it entered the distributor. A quick chop with the Stanley, some solder and a bit of insulation tape fixed that for zero cost.

Nowadays we have done away with the distributor so the coil-packs fail instead, but they cost stupid money to replace.

Progress eh?